<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">

<th:block th:fragment="head">
    <link rel="stylesheet" th:href="@{/css/bootstrap.min.css}"/>
    <script th:src="@{/js/jquery-3.5.1.min.js}"></script>
    <script th:src="@{/js/bootstrap.min.js}"></script>
</th:block>

</html>